This Ecma Standard specifies the following Identification supplementary services:
Calling Line Identification Presentation (SS-CLIP), Connected Line Identification
Presentation (SS-COLP) and Calling/Connected Line Identification Restriction
(SS-CLIR), which are applicable to various basic services supported by
Private Integrated Services Networks (PISN). Basic services are specified
in ECMA-142.

Calling Line Identification Presentation (SS-CLIP) is a supplementary
service which is offered to the called user and which provides the calling
user's PISN number, and possibly a subaddress, to the called user.

Connected Line Identification Presentation (SS-COLP) is a supplementary
service which is offered to the calling user and which provides the called
(connected) user's PISN number, and possibly a subaddress, to the calling
user.

Calling/connected Line Identification Restriction (SS-CLIR) is a supplementary
service offered to a user to restrict presentation of that user's PISN
number to another user.

Supplementary service specifications are produced in three stages, according
to the method described in ETS 300 387. This Standard contains the stage 1 and stage 2 specifications
of SS-CLIP, SS-COLP and SS-CLIR. The stage 1 specifications (clauses 6,
7 and 8) specify the supplementary services as seen by users of PISNs.
The stage 2 specifications (clauses 9, 10 and 11) identify the functional
entities involved in the supplementary services and the information flows
between them.